ASTM A106

Overview

ASTM A106 is a specification for carbon steel alloy pipe intended for high temperature and high pressure applications and is suitable for flanging and bending. It is used in industrial applications including but not limited to: process piping, boiling plants, compression stations, refineries, and steam lines.

First Distributors Inventory





	Size Range:1/8" - 36" Diameter




	Grades:A, B, C




	Schedules:5, 10, 40 (STD), TRUE 40, 80 (XH), TRUE 80, 100, 120, 160, XXH




	Coatings Available:FBE (Fusion Bond Epoxy), TGF3 (Doped & Wrapped), Blasted & Primed, Others Available Upon Request

Ordering Information





	QuantityFeet or number of lengths




	SizeNPS (Outside Diameter) and Schedule Number (Average Wall Thickness)




	GradeGrade A, Grade B (most common), or Grade C




	CoatingBare, Black, FBE, etc




	ManufacturerApproved Manufacturer List (AML), or Country of Origin restrictions

Special/Custom Instructions for Order

  • Hot-finished or cold-drawn
  • Special outside diameter tolerance pipe
  • Inside diameter tolerance pipe
  • Test Report Required
  • Specification designation
  • Hydrostatic test

Manufacturing Considerations

General

  • Hot Finish vs Cold Drawn: Nominal Pipe Sizes 1-1/2" and below may be either cold drawn or hot finished. NPS 2" and larger are hot finished, unless otherwise specified.
  • Purchaser may specify NDE in lieu of hydrostatic test or neither.
  • Killed steel, with primary melting process being open-hearth, basic-oxygen, or electric-furnace, possibly combined with separate degassing or refining.
  • Steel cast in ingots or strand cast is permissible.
  • Heat Treating: Hot-finished pipe need not be heat treated. Cold-drawn pipe shall be heat treated after the final cold draw pass.

Wall Thickness (and Weight)

  • Wall thickness: The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified for the pipe.
  • Weights per foot: The weight of any individual length shall not vary more than 10% over or 3.5% under specification. However, NPS 4" and smaller are weighed in lots. Larger diameter joints are weighed individually.

Diameter

Outside diameter: The outside diameter shall not vary from standard specified in the chart below, at any point.




	NPSOverUnder






	1/8 to 1-1/21/64 (0.015)1/64 (0.015)




	Over 1-1/2 to 41/32 (0.031)1/32 (0.031)




	Over 4 to 81/16 (0.062)1/32 (0.031)




	Over 8 to 183/32 (0.093)1/32 (0.031)




	Over 18 to 261/8 (0.125)1/32 (0.031)




	Over 26 to 345/32 (0.156)1/32 (0.031)




	Over 34 to 483/16 (0.187)1/32 (0.031)

Length

Lengths of A106 seamless carbon steel pipe
  • Single random – 16’ – 24'
  • Double random – 36' – 44’

Marking Requirements

Mark may be applied via: Rolled, die stamped, or paint stenciled (manufacturer’s option).

Content shall include:

  • Manufacturer’s name, brand, or trademark
  • A106 A, A106 B, or A106 C
  • Hydrostatic test pressure and/or NDE, or NH if neither is specified
  • Size, length, weight per foot (NPS 4 and larger)
  • ANSI schedule number or weight class or wall thickness
  • Additional “S” if tested supplementary requirements

Grades

Mechanical Properties





	Grade AGrade BGrade C






	Tensile Strength (min psi)480006000070000




	Yield Strength (min psi)300003500040000

Chemical Requirements

Total of Cr, Cu, Mo, Ni, and V shall not exceed 1%




	(max %)




	ElementCarbonManganesePhosphorusSulfurSiliconCopperNickelChromiumMolybdenumVanadium






	Grade A0.250.27 – 0.930.0350.0350.10.40.40.150.080.08




	Grade B0.30.29 – 1.060.0350.0350.10.40.40.150.080.08




	Grade C0.350.29 – 1.060.0350.0350.10.40.40.150.080.08
*These five elements combined shall not exceed 1% total composition (2010) Unless otherwise specified by the purchaser, for each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified maximum will be permitted up to a maximum of 1.65 %.

Testing Requirements

Hydrostatic Tests:

Hydrostatic Testing: Inspection test pressures produce a stress in the pipe wall equal to 60% of specified minimum yield strength (SMYS) at room temperature. Maximum pressures are not to exceed 2,500 psi for NPS 3" and under, and 2,800 psi for larger sizes. Pressure is maintained for no less than 5 seconds.

Mechanical Tests:

  • Tensile Test: Either transverse or longitudinal are acceptable for NPS 8" and larger.
  • Longitudinal testing only for tensile tests on sizes smaller than NPS 8"
  • Flattening Test only for NPS 2" and larger
  • Bending Test (cold) only for NPS 2 and under




	Degree of BendDiameter of Mandrel






	For normal A106 uses   9012x nominal diameter of pipe




	For close coiling1808x nominal diameter of pipe




	Number of Tests: One tensile test per 200 lengths.




	NPSOn one length from each lot of:




	Tensile5 and smaller400 or less




	6 and larger200 or less




	Bending2 and smaller400 or less




	Flattening2 through 5400 or less




	6 and larger200 or less

Manufacturers





	Arcelor MittalRomania




	ChomutovCzech Republic




	Heng YengChina




	Huta BatoryPoland




	Jiangu Chengde Steel TubeChina




	Lubao SteelChina




	Mittal SteelCzech Republic Romania




	Niko TubeUkraine




	NKK / TenarisJapan




	Productos TubularesSpain




	Sharon TubeUSA




	SidercaArgentina




	Suzhou SeamlessChina




	TamsaMexico




	TenarisItaly




	Tubos ReunidosSpain




	US SteelUSA




	V&MGermany




	VallourecEurope




	Vallourec StarUSA




	Voest AlpineAustria




	VolzhskyRussia




	YYCChina